S-10 Engine Oil Consumption Is Excessive - Komatsu PC88MR-10 Shop Manual

S-10 Engine oil consumption is excessive

Engine oil consumption is excessive.
Failure
Related
If any failure code is displayed, perform troubleshooting for that code first.
information
No. Cause
Dust sucked from air intake
1
system
Broken or worn piston ring
2
Oil leakage from KCCV oil
3
return piping
Oil leakage outside engine
4
Oil leakage from oil filter
5
Oil leakage from oil piping
6
Oil leakage from oil drain plug
7
Oil leakage from oil pan
8
Oil leakage from cylinder
9
head
Worn or damaged rear oil
10
seal
11 Oil leakage from turbocharger
12 Oil leakage from oil cooler
Worn or damaged valve
13
guide or stem seal
PC88MR-10
Point to check, remarks
When intake piping between air cleaner and
engine is removed, dust is found inside.
Measured blowby pressure exceeds
standard value.
Blowby pressure is still high after KCCV
filter element is replaced.
Measure compression pressure (see
Standard value table).
(Reference: See Testing and adjusting,
"Testing compression pressure".)
Check oil leakage from KCCV oil return
piping.
Check for oil leakage.
Check oil filter for oil leakage.
Check oil piping for oil leakage.
Check oil drain plug for oil leakage.
Check oil pan for oil leakage.
Check cylinder head for oil leakage.
Oil in clutch chamber or damper chamber
on machine increases.
turbocharger blower inlet and outlet, and
turbine outlet are dirty with oil.
Check whether turbocharger shaft rotates.
(Move turbocharger vanes with hand in axial
and radial directions to make judgment.)
Oil is in coolant.
Remove oil cooler and check for oil leakage
outside oil cooler.
Check oil cooler for oil leakage by applying
air pressure.
Check valve guide and stem seal.
Remove cylinder head, and check inside
diameter of guide and stem seal for
damage.
(Reference: See "Maintenance standards".)
40 Troubleshooting
Troubleshooting of engine (S-mode)
(D37-B10-400-A-Z0-A)
Clean or replace intake
piping.
Replace piston ring or
correct its installation.
Correct installation of
oil piping or replace it.
Repair oil leaks.
Reinstall or replace oil
filter.
Correct installation of
oil piping or replace it.
Retighten oil drain
plug.
Correct installation of
oil pan or replace it.
Correct installation of
cylinder head or
replace it.
Correct installation of
rear oil seal or replace
it.
Replace turbocharger.
Replace oil cooler.
Replace valve guide or
stem seal.
Remedy
40-529